[ http://wso2.org/jira/browse/ESBJAVA-370?page=all ]
indika kumara resolved ESBJAVA-370.
-----------------------------------
Fix Version/s: NIGHTLY
Resolution: Fixed
This error was occurred when try to resend the same response message
(HttpRespone) again. HttpRespone always checks for availability of http headers
before sending it and if already available then throws corresponding exception.
With the provided configuration sending twice will occur ,only when all the
child endpoints of Loadbalance endpoint are inactive. In this scenario the
onError ('fault') sequence invokes with the message (the message which are
injected to the endpoints ) and because all child endpoints are inactive ,
onError sequence will execute and then ,using this message ,the send mediator
inside ('fault') sequence will send response back to the client (first time
sending)and then message going to the out mediator (because the property
mediator has already set the message as a response( <syn:property
name="RESPONSE" value="true"/>). The send mediator inside the out mediator will
try to resend same response(second time) and throws the Exception ). This
exception will not occur if any child endpoint with in the LoadBalance
endpoint is active ( If one or more times synapse call an external endpoint).In
this case , the message going through the onError sequence and the message
going through the main sequence are different .This is happen , because we
always clone the message before send it to an external endpoint . Therefore ,
the mediators with in the onError sequence process the cloned message and the
message mediation through this sequence will not effect the message mediation
through the main sequence. With in the onError sequence , sets the cloned
message as a response and send it back to the client. Any property that are set
to the cloned message will not effect to original message and so cloned message
will behave as response message after ( <syn:property name="RESPONSE"
value="true"/>) but original message will not see this and it never go through
out mediator , therefore second time sending will not occurred. This is the
expected behavior . By properly writing configuration this will eliminates .
please use drop mediator after the send mediator of the in mediator and then
it will works for both scenario .
<in>...
<send>
<endpoint>
<loadbalance>............</loadbalance>
</endpoint>
</send>
<drop/>
</in>
> "Transfer-encoding header already present" error occurred when trying out a
> scenario with load balancing
> --------------------------------------------------------------------------------------------------------
>
> Key: ESBJAVA-370
> URL: http://wso2.org/jira/browse/ESBJAVA-370
> Project: WSO2 ESB
> Issue Type: Bug
> Components: Endpoints Management
> Affects Versions: 1.5-beta-1
> Environment: Ubuntu7.04, JDK1.5.0_12, Firefox 2.0.0.9
> Reporter: Evanthika Amarasiri
> Assigned To: indika kumara
> Fix For: NIGHTLY
>
>
> Below are the steps to reproduce the issue
> 1. Created the configuration as follows
> <syn:sequence name="loadbalance_sample" onError="fault">
> <syn:in>
> <syn:send>
> <syn:endpoint>
> <syn:session type="simpleClientSession"/>
> <syn:loadbalance algorithm="roundRobin">
> <syn:endpoint>
> <syn:failover>
> <syn:endpoint>
> <syn:address
> uri="http://localhost:9000/soap/LBService1";>
> <syn:enableAddressing/>
> </syn:address>
> </syn:endpoint>
> <syn:endpoint>
> <syn:address
> uri="http://localhost:9002/soap/LBService1";>
> <syn:enableAddressing/>
> </syn:address>
> </syn:endpoint>
> </syn:failover>
> </syn:endpoint>
> <syn:endpoint>
> <syn:failover>
> <syn:endpoint>
> <syn:address
> uri="http://localhost:9003/soap/LBService1";>
> <syn:enableAddressing/>
> </syn:address>
> </syn:endpoint>
> <syn:endpoint>
> <syn:address
> uri="http://localhost:9004/soap/LBService1";>
> <syn:enableAddressing/>
> </syn:address>
> </syn:endpoint>
> </syn:failover>
> </syn:endpoint>
> </syn:loadbalance>
> </syn:endpoint>
> </syn:send>
> </syn:in>
> <syn:out>
> <syn:send/>
> </syn:out>
> </syn:sequence>
> <syn:sequence name="fault">
> <syn:makefault version="soap12">
> <syn:code xmlns:sf12="http://www.w3.org/2003/05/soap-envelope";
> value="sf12:Receiver"/>
> <syn:reason value="COULDN'T SEND THE MESSAGE TO THE SERVER."/>
> </syn:makefault>
> <syn:header name="To" action="remove"/>
> <syn:property name="RESPONSE" value="true"/>
> <syn:send/>
> </syn:sequence>
> NOTE: Assume that all the servers are up and running and send a loadbalance
> request and see that the responses are received properly
> 2. Now one by one shut down the servers until the client fails to execute and
> you get the error message "COULDN'T SEND THE MESSAGE TO THE SERVER."
> 3. Then start all the servers one by one and wait for a while before sending
> the request once more.
> 4. Once you send the requests the client will fail and you will get the
> following error message on the ESB console
> 2007-11-26 11:21:52,146 [127.0.1.1-testc-ubuntu] [HttpServerWorker-19] ERROR
> ServerHandler Unexpected HTTP protocol error : Transfer-encoding header
> already present
> org.apache.http.ProtocolException: Transfer-encoding header already present
> at
> org.apache.http.protocol.ResponseContent.process(ResponseContent.java:67)
> at
> org.apache.http.protocol.BasicHttpProcessor.process(BasicHttpProcessor.java:304)
> at
> org.apache.synapse.transport.nhttp.ServerHandler.commitResponse(ServerHandler.java:220)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.sendAsyncResponse(HttpCoreNIOSender.java:360)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.invoke(HttpCoreNIOSender.java:225)
> at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:396)
> at
> org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:104)
> at
> org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:197)
> at
> org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:97)
> at
> org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
> at
> org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:122)
> at
> org.apache.synapse.mediators.MediatorFaultHandler.onFault(MediatorFaultHandler.java:79)
> at org.apache.synapse.FaultHandler.handleFault(FaultHandler.java:94)
> at org.apache.synapse.FaultHandler.handleFault(FaultHandler.java:100)
> at
> org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:95)
> at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:145)
> at
> org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:275)
> at
> org.apache.synapse.transport.nhttp.ServerWorker.processPost(ServerWorker.java:219)
> at
> org.apache.synapse.transport.nhttp.ServerWorker.run(ServerWorker.java:183)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
> at java.lang.Thread.run(Thread.java:595)
> 2007-11-26 11:21:52,190 [127.0.1.1-testc-ubuntu] [HttpServerWorker-19] ERROR
> HttpCoreNIOSender IO Error sending response message
> org.apache.axis2.AxisFault
> at org.apache.axis2.AxisFault.makeFault(AxisFault.java:417)
> at
> org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:72)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.sendAsyncResponse(HttpCoreNIOSender.java:370)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.invoke(HttpCoreNIOSender.java:225)
> at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:396)
> at
> org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:104)
> at
> org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:197)
> at
> org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:97)
> at
> org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
> at
> org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:122)
> at
> org.apache.synapse.mediators.MediatorFaultHandler.onFault(MediatorFaultHandler.java:79)
> at org.apache.synapse.FaultHandler.handleFault(FaultHandler.java:94)
> at org.apache.synapse.FaultHandler.handleFault(FaultHandler.java:100)
> at
> org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:95)
> at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:145)
> at
> org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:275)
> at
> org.apache.synapse.transport.nhttp.ServerWorker.processPost(ServerWorker.java:219)
> at
> org.apache.synapse.transport.nhttp.ServerWorker.run(ServerWorker.java:183)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
> at java.lang.Thread.run(Thread.java:595)
> Caused by: com.ctc.wstx.exc.WstxIOException: null
> at com.ctc.wstx.sw.BaseStreamWriter.flush(BaseStreamWriter.java:313)
> at
> org.apache.axiom.om.impl.MTOMXMLStreamWriter.flush(MTOMXMLStreamWriter.java:118)
> at
> org.apache.axiom.om.impl.llom.OMNodeImpl.serialize(OMNodeImpl.java:401)
> at
> org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:66)
> ... 19 more
> Caused by: java.nio.channels.ClosedChannelException
> at sun.nio.ch.SinkChannelImpl.ensureOpen(SinkChannelImpl.java:136)
> at sun.nio.ch.SinkChannelImpl.write(SinkChannelImpl.java:140)
> at java.nio.channels.Channels.write(Channels.java:60)
> at java.nio.channels.Channels.access$000(Channels.java:47)
> at java.nio.channels.Channels$1.write(Channels.java:134)
> at com.ctc.wstx.io.UTF8Writer.flush(UTF8Writer.java:96)
> at
> com.ctc.wstx.sw.BufferingXmlWriter.flush(BufferingXmlWriter.java:214)
> at com.ctc.wstx.sw.BaseStreamWriter.flush(BaseStreamWriter.java:311)
> ... 22 more
> 2007-11-26 11:21:52,348 [127.0.1.1-testc-ubuntu] [HttpServerWorker-19] ERROR
> Axis2Sender Unexpected error sending message back
> org.apache.axis2.AxisFault: IO Error sending response message
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.handleException(HttpCoreNIOSender.java:478)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.sendAsyncResponse(HttpCoreNIOSender.java:374)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.invoke(HttpCoreNIOSender.java:225)
> at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:396)
> at
> org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:104)
> at
> org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:197)
> at
> org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:97)
> at
> org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
> at
> org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:122)
> at
> org.apache.synapse.mediators.MediatorFaultHandler.onFault(MediatorFaultHandler.java:79)
> at org.apache.synapse.FaultHandler.handleFault(FaultHandler.java:94)
> at org.apache.synapse.FaultHandler.handleFault(FaultHandler.java:100)
> at
> org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:95)
> at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:145)
> at
> org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:275)
> at
> org.apache.synapse.transport.nhttp.ServerWorker.processPost(ServerWorker.java:219)
> at
> org.apache.synapse.transport.nhttp.ServerWorker.run(ServerWorker.java:183)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
> at java.lang.Thread.run(Thread.java:595)
> Caused by: org.apache.axis2.AxisFault
> at org.apache.axis2.AxisFault.makeFault(AxisFault.java:417)
> at
> org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:72)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.sendAsyncResponse(HttpCoreNIOSender.java:370)
> ... 18 more
> Caused by: com.ctc.wstx.exc.WstxIOException: null
> at com.ctc.wstx.sw.BaseStreamWriter.flush(BaseStreamWriter.java:313)
> at
> org.apache.axiom.om.impl.MTOMXMLStreamWriter.flush(MTOMXMLStreamWriter.java:118)
> at
> org.apache.axiom.om.impl.llom.OMNodeImpl.serialize(OMNodeImpl.java:401)
> at
> org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:66)
> ... 19 more
> Caused by: java.nio.channels.ClosedChannelException
> at sun.nio.ch.SinkChannelImpl.ensureOpen(SinkChannelImpl.java:136)
> at sun.nio.ch.SinkChannelImpl.write(SinkChannelImpl.java:140)
> at java.nio.channels.Channels.write(Channels.java:60)
> at java.nio.channels.Channels.access$000(Channels.java:47)
> at java.nio.channels.Channels$1.write(Channels.java:134)
> at com.ctc.wstx.io.UTF8Writer.flush(UTF8Writer.java:96)
> at
> com.ctc.wstx.sw.BufferingXmlWriter.flush(BufferingXmlWriter.java:214)
> at com.ctc.wstx.sw.BaseStreamWriter.flush(BaseStreamWriter.java:311)
> ... 22 more
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